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A special optical window is required to do the latter measurements. Melanin is the natural chromophore for targeting hair follicles in the visible to near-infrared region, Lasers or light sources that operate in the red or near-infrared wavelength region lie in an optical window of the spectrum in which selective absorption by melanin is combined with deep penetration into the dermis. The neutron beam windows are made out of AlMg3 alloy machined to 150 [micro]m thickness, the cold optical windows are 3 mm thick sapphire. |
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